312 



MUSCLES OF THE PIG 



The stemo-cephalicus (Sterno-mastoideus) arises on the sternum and is in- 

 serted by a long round tendon on the mastoid process. 



The thyroid jDortion of the sterno-thyro-hyoideus has a pecuhar arrangement. 

 It arises (separately from the opposite muscle) on the manubrium sterni. About 

 the middle of the neck it has an oblique tendinous intersection, beyond which it 

 divides into two branches; one of these is inserted in the usual fashion, the other 

 ends on the laryngeal prominence. The hyoid portion is well developed. 



The omo-hyoideus is thin. It arises as in the horse, but has no connection 

 with the mastoido-humeralis nor with the opposite muscle. 



The omo-transversarius arises on the first or second cervical vertebra (under 

 cover of the mastoido-humeralis), and is inserted into the lower part of the scapular 



spme. 



There are two scaleni. 



The scalenus ventralis (s. primse costse) resembles 



Fig. 226. — Superficial Muscles of Pic, .\fter Removal of Panniculus Carnosus. 

 a, Levator nasolabialis; 6, levator labii superioris proprius; ti' , fleshy slip of b which comes from pre- 

 maxilla; c, dilatator naris lateralis; d, depressor rostri; e, orbicularis oris; /, depressor labii inferioris; g, zygo- 

 maticus; h, masseter; i, i', i" , brachio-cephalicus (cleido-occipitalis, cleido-raastoideus, pars clavicvilaris) ; k, 

 sterno-cephalicus; I, sterno-hyoideus; m, omo-transversarius; n, n', trapezius; o, anterior deep pectoral; ;>, 

 latissimus dorsi; g, lumbo-dorsal fascia; r, obliquus abdominis externus; r', aponeurosis of r; s, serratus posticus; 

 i, serratus magnus; u, posterior deep pectoral; v, supraspinatus; u', «>', deltoideus; x, long head of tricejjs; y, 

 external head of triceps; 2, tensor fascire antibrachii; 1, braehialis; 2, extensor carpi radialis; 3, extensor digiti 

 quarti; 4. extensor digiti tiuinti; 5, extensor carpi ulnaris; 6, ulnar head of deep flexor; 7, gluteus medius; 8, 

 tensor fasci;p latir; 9, 10, 10' , bice])s femoris; 11, semitendinosus; 12, semimembranosus; IS, caudal muscles; 

 IJt, jjanniculus adiposus in section. (After EUenberger, in Leisering's .\tlas.) 



that of the ox, is attached to the last four cervical vertebrae, and is perforated by 

 the nerves of the brachial plexus. The scalenus dorsalis (s. supracostalis) arises 

 on the transverse processes of the third to the sixth cervical vertebra, and ends on 

 the third rib. 



The straight muscles of the head present no special features. 



The longus colli is separated from the opposite muscle, so that part of the 

 bodies of the cervical vcTtebrje is exposed as in man. 



The intertransversales resemble those of the ox. 



The splenius is thick and extensive. It ends in three parts on the occipital, 

 the temj)oral, and the wing of the atlas (inconstant). 



The trachelo-mastoideus is small, and its atlantal portion is blended with the 

 longissimus. 



The complexus is large, and is clearly divided into two portions: the dorsal 



